diff --git a/ChangeLog b/ChangeLog
index ff7f38f..df3c010 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,7 @@
 
         Improve documentation and tutorials (#2962)
         Fix OpenMP issue in ctbin when using energy bounds from file (#2912)
+        Fix multi-instrument handling in csbkgmodel (#2862)
 
 
 2019-06-05
diff --git a/NEWS b/NEWS
index 959e282..a078b74 100755
--- a/NEWS
+++ b/NEWS
@@ -138,7 +138,9 @@ None
 
 csbkgmodel - Generate background model for 3D analysis
 ------------------------------------------------------
-None
+The script now handles observation definition files with multiple instruments,
+stripping all instruments that do not corresponds to the "instrument" parameter
+(#2862).
 
 
 cscaldb - Inspect calibration database
diff --git a/doc/source/admin/release_history/1.6.2.rst b/doc/source/admin/release_history/1.6.2.rst
index 04782a0..6df63c1 100644
--- a/doc/source/admin/release_history/1.6.2.rst
+++ b/doc/source/admin/release_history/1.6.2.rst
@@ -14,3 +14,5 @@ The following bugs were fixed:
   Improve documentation and tutorials
 * [`2912 <https://cta-redmine.irap.omp.eu/issues/2912>`_] -
   Fix OpenMP issue in ctbin when using energy bounds from file
+* [`2862 <https://cta-redmine.irap.omp.eu/issues/2862>`_] -
+  Fix multi-instrument handling in :ref:`csbkgmodel`